Question

# If $$60\%$$ of a first order reaction was completed in $$60$$ minute, $$50\%$$ of the same reaction would be completed in approximately?

A
46 minute
B
60 minute
C
40 minute
D
50 minute

Solution

## The correct option is A $$46$$ minuteIts a 1st Order reaction.$$k = \dfrac{2.303}{60} log \dfrac{100}{40}$$$$k = 0.015\space {min}^{-1}$$$$t = \dfrac{2.303}{0.015} log \dfrac{100}{50}$$$$t = 46\space min$$Hence, the correct option is $$A$$Chemistry

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